Latitude: Notice how lines of latitude are based off off of four points: North Pole, South Pole, Earth's Axis, and the Equator. Lines of Latitude never touch, hence the alternate name "Parallels". Latitude is measured from 0 to 90 degrees North and 0 to 90 degrees South.

Longitude: Longitude is measured from 0 degrees (Prime Meridian) to 180 degrees East and 180 degrees West. These lines are not parallels as they touch and the North and South Poles. The Prime Meridian is based out of the Royal Observatory in Greenwich, England.

Latitude and Longitude: When you put both together you get absolute location.

Georgia's Physiographic Regions

Elevation is height above sea level, whereas, Relief is difference in elevation within a landform (such as the height of a mountain from its base to its peak). Elevation influences not only temperature, but also precipitation.

Physiographic regions are based on land formations, elevation, rocks and minerals, soil, and climate. Georgia is crossed by the Coastal Plain, Piedmont, Blue Ridge, Ridge and Valley, and Appalachian Plateau (sometimes called the Cumberland Plateau).

There are 25 physiographic regions in the continental United States (26 including the continental shelf)...Alaska has 4 and Hawaii, 1.

The Fall Line is a region several miles across that marks the prehistoric shoreline. Land to the north of the line is higher in elevation than that to the south, causing rivers to pick up speed as they travel. This zone was instrumental in the early development of the state because of river travel and water power.

Rocks and minerals have also played a large role in the development of Georgia. Georgia is the world leader of kaolin production (used in the production of glossy paper) and national leader in marble production. Of course, gold brought early explorers such as Hernando de Soto (in 1540) and eventually hastened the removal of the Cherokee Indians in the 1830s.

﻿Georgia's Coast, Waterways, Weather and Climate﻿

Georgia's chain of sea islands are called "barrier islands" because they form a barrier, or wall, blocking ocean waves and wind from directly hitting the mainland. They are sometime called the "Golden Isles" because early explorers expected to find gold there. Later, the name took on another meaning as millionaires from the North began buying these island and building spacious winter homes there in the 1800s. Today, many of these islands are protected by the state and federal government.

Rivers are one of Georgia's most important resources......they provide drinking water to half of the states population....they are used by many different industries (most notably carpet manufacturing)....they are essential for wastewater disposal....they are used for transportation....they are important for fishing, boating and other types ofrecreation....they are habitats for wildlife.In Georgia's history, rivers......were used to generate power for mills before electricity....affected the location of settlements....were frequently used to mark county boundaries, and......were selected to form part of Georgia's boundaries with Alabama and Florida, and all of its boundaries with South Carolina.

Notice that most of Georgia's rivers in the east empty into the Atlantic Ocean...many rivers to the south and west empty into the Gulf of Mexico due to their location in relation to the continental divide.

Most of Georgia lakes are located north of the Fall Line for two reasons:1. Most Georgian live north of the Fall Line (70% of all Georgians)2. There is no major underground source of water- The lakes are artificial in nature and have been build within the 20th century to accomodate Georgia's growing population.- Georgia's dams and reservoirs convert flowing water for electricity...they also prevent flooding, supply water to nearby cities, provide downstream navigation, provide recreation, and are important to fish and wildlife conservation.

Groundwater- South of the Fall Line, water for cities, irrigation, and other uses come from groundwater in artisian aquifers. Here, because of make up of the earth below the surface (sedimentary beds of sand and porous rock such as limestone), the ground can store vast amounts of water called groundwater. Water-saturated layers of earth are called aquifers.There are two types of aquifers:1. Water Table2.Artesian

Weather- refers to the day-to-day conditions in the atmosphere.Climate- refers to the average weather conditions over time- at least 25 to 30 years.Georgia's climate is determined by its geographic location...it is near the Atlantic Ocean and Gulf of Mexico, and the eastern edge of the continent...combined with Georgia's closeness to the Equator the result is hot summers, mild winters, and, in most years, abundant rainfall throughout the state. Generally, there is a wide range between the highest and lowest temperatures during the year with Summer being the longest season. Summers have high humidity and high temperatures, while Spring and Fall are mild. Winters are generally short and mild, although there may be several cold spells each year...while snow may fall, particularly in the higher elevations, it usually melts within a few days...Lakes and rivers seldom freeze over. Precipitation is spread over the year, although not uniformly.- Notice that the vast majority of rainfall occurs in the Blue Ridge region of Georgia.

Wind and Ocean Currents: The main cause of air and water currents is the uneven heating of the earth by the sun. The sun strikes the earth most directly at the Equator and least directly at the poles. Around the earth, air is always flowing from areas of high pressure (cool air) to those of low pressure (warm air). This constant shifting creates air currents. Note that wind currents are named after their point of origin.

Similar to air currents are the movements of water masses in the ocean. Near the surface, these tend follow the general path of air currents. Water currents result from wind action and the uneven heating of the world's oceans by the sun.

Continental Shelf- the continenal shelf is an underwater ledge that extends out 70 or 80 miles off Georgia's coast. This "ledge" drops about two feet for each mile awat from shore...after that, the sea bed drops more sharply. As you can see on the graphic, the continental shelf influences the path of the Gulf Stream (warm water current). The Gulf Stream stays in deeper water beyond the continental shelf. This influences most hurricane storms to move northward. In addition, Georgia's short, curved coastline is less exposed to the full impact of hurricanes than eith Florida or the Carolinas. Only four hurricanes have struck Georgia directly in the last century, the last being Hurricane David in 1979. The worst storm in terms of human life to hit Georgia struck Savannah in 1893.